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Finding the Fourth Proportional to 660.45, 990.70 and 173.49

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Solution

The fourth proportional to 660.45, 990.70 and 173.49 is: 260.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    660.45 : 990.70 = 173.49 : x
  2. Step 2: Convert to fraction form
    660.45/990.70 = 173.49/x
  3. Step 3: Cross multiply
    660.45x = 990.70 × 173.49
  4. Step 4: Simplify right side
    660.45x = 171,876.54
  5. Step 5: Solve for x
    x = 171,876.54/660.45
  6. Step 6: Final answer
    x = 260.24

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.